Hi guys!
i’ve never worked with carbon fiber… but i need to produce something like a pipe, made of carbon fiber for a school project. The question is, is it possible to produce a “pipe” made of carbon that could resist to a 100kg perpendicular weight? It cannot bend much.
If it is possible, someone could hint how many layers of 200g CF should work? which resin? the pipe needs to have 1 meter.
Thank you!
poke around here (use search)
there are some discussions on making tube. I guess ultimately you could make a tube to meet your needs but, you’ll probably have to do testing in order to verify that it meets your strength requirements.
There are also manufacturers of tube whom you might want to ask this question to. A premade tube might be easier than building your own.
As for how many plies and what resin. Depends… Resin, epoxy is good, and there are many kinds of that depending on what properties you need.
And I"m not sure what you mena by it needs to have 1 meter?
It needs to be 1 meter long …
What about the diameter ?
If you explain what/ how it will be used I think it will easier to understand what you are trying to achieve
Hey guys! thank you for your interest.
Answering questions:
i mean that the tube must be 1 meter long.
About the diameter… could be any diameter if it can support the weight.
I want to build a handbike for a classmate (he is paraplegic). Its something like a bicycle, but you use your hands. Anyway, it’s my “graduation project”. I could make some tubes and test, but CF here is a bit expensive, if someone could at least say “hey, i think 3 layers would do the work” i could at least have some idea.
About the resin… i found one called epoxy SQ 2001, the website says its recommended to work with CF.
Any doubts, please ask!
okay thats better 
if you want to do carbon on the cheap … what i would do …
using a cardboard tube wrapped in packaging tape, like the ones that you use for posting stuff , id wrap 4 layers of normal 200 gram fiber glass first and allow it to cure … then i would sand it as it will go ‘out of round’ if you just doing a wet lap up
and then i would do a carbon skin, 1 layer if things are really tight , but 2 layers would cover better
you can then soak it in water and the cardboard will come out quite easily
Fiberglass? Are you sure?
I’ve read some articles about mixing fibers… Especially mixing glass and carbon and weren’t good.
The elasticity of these 2 fibers are too different… When you add the load, it will be distributed only on the carbon fiber, cuz its elasticity coeficient is really low.
Dont you think it would be better to use just CF? Aah, great news! We got a sponsor! :laugh:
They will pay for structural materials.
So, you’d still use FG AND CF or would change something?
You might want to consider using braided tube, then you have no overlaps and the fibers are extra long for increased strength
I"ve used A&P Technology’s materials, good stuff: http://www.braider.com/
First time with cf …
Have a play with cf first 
Guys mix cf and fg all the time. Is this piece going to the moon on a mission ? No , I really wouldn’t worry about the expansion , compression bla bla bla … You say it needs to be done on a budget , then I wouldn’t even bother to use cf , unless you want ‘that’ look
Making it from cf , it’s gonna weigh 300 grams for example. Making it from fg it’s gonna weigh 400 grams … Is that 100 grams really critical ? That’s what I’m getting at
+1 on using a sock , what’s nice is if you hang a weight on the end it does down nice and tight .
sammymatik: really awesome but i really dont know where i can find these products here… im using another generic brands 
Blackrat: alright man, you convinced me hahaha my only concern is about supporting the weight… I really dont care about the appearence. I’ll make it and i’ll post the results! Thank you for you patience!
you can call them and they’ll mail the materials to you. They’re pretty helpful and have really good products. I made a beam for a school project using their materials that held 9000lbs with like .1" deflection and weighed 3.1lbs.
awesome stuff if you have the money. You could probably use one ply of the right weight to achieve your needs. They have Uni as well.